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2023’s Top 5 Senior Frontend Engineer Interview Questions in Big Tech

Asim Zaidi
7 min readMar 26

Senior frontend engineers are in high demand in big tech companies, and the interview process for these roles can be challenging. In this article, we will discuss the top 5 senior frontend engineer interview questions that you are likely to encounter when interviewing for a frontend engineering role in a big tech company in 2023. We will provide you with code samples, answers, and walkthroughs to help you prepare for these questions and ace your interview.

Question 1: How would you optimize the performance of a web page?

Performance optimization is a critical aspect of frontend development, and this question is a standard one in frontend engineering interviews. The interviewer is looking for your ability to improve page loading times and make the website more efficient.

To answer this question, you should discuss several strategies, including minimizing HTTP requests, caching, code optimization, and image optimization.

Minimizing HTTP requests:

HTTP requests can be a significant factor in page loading times. The more requests a page makes, the longer it takes to load. To minimize HTTP requests, you can combine CSS and JavaScript files, use image sprites, and compress all your files.


Caching can significantly improve page loading times by reducing the amount of data that needs to be downloaded. You can use browser caching, CDN caching, and server-side caching to speed up page load times.

Code optimization:

Optimizing your code can also improve page loading times. You can use asynchronous scripts, reduce code duplication, and minify your code to make it more efficient.

Image optimization:

Images can be a significant factor in page loading times, especially if they are large. To optimize your images, you can use appropriate image formats, compress them, and lazy-load them.

Code sample — Here is an example of how to use asynchronous scripts to improve page loading times:

<script async src="script.js"></script>

Asim Zaidi

Building AI Hub @Apple | Prev: SSWE @Atlassian | Co-Founder | Shipping products users love | Helping people break into tech @